Why do we expect GZK cutoff at the energies 6x10^19 eV ?

Subject: Why do we expect GZK cutoff at the energies 6x10^19 eV ?

Date: Wed Apr 27 16:30:49 2005
Posted by Marianna
Grade level: grad (science) School: UK
City: Lexington State/Province: No state entered. Country: USA
Area of science: Physics
ID: 1114637449.Ph

Message:


As far as I know the proton pair production threshold energy is ~5x10^17ev ,and 
GZK (Greisen-Zatsepin-Kuzmin) threshold energy is ~6x10^19eV. If the proton pair
production threshold energy is lower then the GZK threshold, why do we expect
cutoff at GZK limit ?

Re: Why do we expect GZK cutoff at the energies 6x10^19 eV ?

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